Fundamental Technologies

Voyager LECP Pages

Figure 6.3-3. LECP EDR Science Data Block Organization (CR-3)

Logical records are written into physical record data blocks according to the following algorithm:

Let K.1, K.2, K.3 denote segments 1, 2, and 3 of logical record K.
Let N = (SCT60 Modulo 6)/2 = 0

Physical Record
N+1

Physical Record
N+2

Physical Record
N+3
MF K.SEG MF K.SEG MF K.SEG
1 1.1 41 14.2 81 27.3
2 1.2 42 14.3 82 28.1
3 1.3 43 15.1 83 28.2
: : : : : :
38 13.2 78 26.3 118 40.1
39 13.3 79 27.1 119 40.2
40 14.1 80 27.2 120 40.3

Logical Record 1 appears at the beginning of a data block once every three physical records (120 MF; 4.8 min) when SCT60 Modulo 6 = 0. A segment number of (SCT60 Modulo 6)/2+1 will be inserted into the EDR header of each physical record to indicate which of the above three data block patterns appear in a given physical record.

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Last modified 12/3/02, Tizby Hunt-Ward
tizby@ftecs.com